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State the meaning of 1 pascal. A boy of mass 40 kg is standing on loose sand . If the area of his feet is 0.04 m .Find the pressure exerted by boy on sand . ( g=10 m\s)

Answer :

1 pascal is the pressure exerted or experienced by a body or object when a thrust of 1 N acts on an area of 1 metre.sq.

Mass of boy = 40 kg 
Weight of Boy= 40 × g
                     = 40 × 10 = 400 N
Area = 0.04m.sq
 
Pressure = Force/Area
              = 400/0.04
              = 400 × 100 / 4
              = 100 × 100 
              = 10000 Pa

Answer:

P= F/A = mg/A= 40*10/0.04=10000pa answer

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